I need a read variable function block to read values from a relay through Modbus communication. Is there anything like that available in Codesys
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Guess you are using AC500 PLC. A MODBUS_AC500_V10.lib will be included in your application automatically i f you configure the Interfaces COM port with modbus protocol in Automation Builder. Function Block COM_MOD_MAST can be used to send/ received Modbus telegrams via COM interface. Hope it helps.
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